Aristotelia hemisarca is a moth of the Gelechiidae family. It was described by Lower in 1916. It is found in Australia, where it has been recorded from New South Wales.
The wingspan is about 16 mm. The forewings are dull fuscous and obscure markings. There is a moderately broad outwardly oblique transverse whitish-ochreous fascia, from the costa at one-sixth to the dorsum at one-fifth, where it becomes confluent with a moderate ochreous-whitish dorsal streak, somewhat suffused, from near the base to the tornus. There is an obscurely-edged ochreous-whitish transverse fascia, from the costa at five-sixths to the tornus, separated from the dorsal streak by a patch of ground-colour. There is a four or five quadrate spots of ochreous-white on the costa, between the posterior edge of the previous fascia and the apex, separated by similar-sized spots of ground-colour. The hindwings are pale greyish.